Merge branch 'utils/gitlab' into 'develop'

.gitlab-ci/clang10-mpi-debug.yml

.gitlab-ci/clang10-mpi-release.yml

.gitlab-ci/gcc10-mpi-coverage.yml

.gitlab-ci/gcc10-mpi-release.yml

.gitlab-ci/gcc10-seq-coverage.yml

.gitlab-ci/gcc10-seq-release.yml

CMakeLists.txt

src/language/algorithms/AcousticSolverAlgorithm.cpp

src/language/algorithms/AcousticSolverAlgorithm.hpp

src/language/algorithms/CMakeLists.txt

src/language/modules/SchemeModule.cpp

src/mesh/MeshData.hpp

src/output/GnuplotWriter.cpp

src/output/WriterBase.cpp

src/output/WriterBase.hpp

src/scheme/AcousticSolver.cpp

src/scheme/AcousticSolver.hpp

src/scheme/AcousticSolverType.hpp

src/scheme/BlockPerfectGas.hpp

src/scheme/CMakeLists.txt